Finding the Fourth Proportional to 2,570.91, 3,856.06 and 722.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.91 : 3,856.06 = 722.17 : x
2. Step 2: Convert to fraction form
   2,570.91/3,856.06 = 722.17/x
3. Step 3: Cross multiply
   2,570.91x = 3,856.06 × 722.17
4. Step 4: Simplify right side
   2,570.91x = 2,784,730.85
5. Step 5: Solve for x
   x = 2,784,730.85/2,570.91
6. Step 6: Final answer
   x = 1,083.17